01 - Place the frozen banana slices into a high-powered blender or food processor bowl.
02 - Blend on high speed, pausing to scrape down the sides with a rubber spatula as needed, until the mixture becomes completely smooth and creamy, about 1 to 2 minutes.
03 - Add vanilla extract, cocoa powder, or frozen berries if desired, then blend again briefly until evenly combined.
04 - For a firmer, scoopable consistency, transfer the nice cream to a freezer-safe container and freeze for 1 to 2 hours before serving.
05 - Scoop into bowls, top with chopped nuts, cacao nibs, or fresh fruit as desired, and serve immediately.